Aqueous solution for improving CO2 flooding effect of tight reservoir and preparation method and application method of aqueous solution

A technology for tight reservoirs and application methods, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as inability to drive out crude oil, inability to enter matrix micropores, etc., and achieve enhanced oil recovery Effect

Active Publication Date: 2019-10-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of CO 2 It cannot enter the micropores of the matrix, and the crude oil in it cannot be driven out. The problem of improving the gas drive effect cannot be achieved only by plugging the fractures; it provides a method to improve the CO in tight reservoirs. 2 Aqueous solution with flooding effect, so as to achieve enhanced oil recovery

Method used

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  • Aqueous solution for improving CO2 flooding effect of tight reservoir and preparation method and application method of aqueous solution
  • Aqueous solution for improving CO2 flooding effect of tight reservoir and preparation method and application method of aqueous solution

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preparation example Construction

[0031] A second aspect of the present invention provides the aforementioned enhanced CO in tight reservoirs 2 A preparation method of an aqueous solution with a flooding effect, the preparation method comprising: mixing water, a wettability modifier, a penetrant and a surfactant for reducing the oil-water interfacial tension to obtain the improved CO2 in a tight reservoir. 2 Aqueous solution with flooding effect.

[0032] As a preferred solution, add water, wettability modifier, penetrating agent and surfactant to reduce oil-water interfacial tension in sequence, stir well after each addition of a chemical agent, and add the next chemical agent after the added chemical agent is completely dissolved. agent, until all components are added and finally a uniform and transparent aqueous solution is formed, that is, the improvement of CO in tight reservoir 2 Aqueous solution with flooding effect.

[0033] As a preferred solution, the enhanced tight reservoir CO of the present inve...

Embodiment 1

[0039] This embodiment provides a method to improve CO in tight reservoirs 2 The aqueous solution with flooding effect, based on the total weight of the aqueous solution, the aqueous solution includes: 0.1 wt % of wettability modifier, 0.03 wt % of penetrating agent, 0.4 wt % of surfactant to reduce oil-water interfacial tension, and the rest is water; The wettability modifier is disodium lauryl sulfosuccinate monoester, the penetrant is isooctanol polyoxyethylene ether phosphate, and the surfactant that reduces the oil-water interfacial tension is cocamidopropyl hydroxy Sulfobetaine and lauramidopropyl hydroxysulfobetaine, the mass ratio of described cocamidopropyl hydroxysulfobetaine and lauramidopropyl hydroxysulfobetaine is 1:1, and the water is oil The water was injected back from Tibet, and the salinity was 14000mg / L.

[0040] The preparation method is as follows: adding water, a wettability modifier, a penetrating agent, and a surfactant for reducing the oil-water inte...

Embodiment 2

[0042] This embodiment provides a method to improve CO in tight reservoirs 2 The aqueous solution with flooding effect, based on the total weight of the aqueous solution, the aqueous solution includes: 0.03 wt % of wettability modifier, 0.07 wt % of penetrant, 0.15 wt % of surfactant that reduces oil-water interfacial tension, and the rest is water; The wettability modifier is disodium lauryl sulfosuccinate monoester, the penetrating agent is octaquinol polyoxyethylene ether phosphate, and the surfactant that reduces the oil-water interfacial tension is cocamidopropyl hydroxy Sulfobetaine, the water is reservoir reinjection water, and the salinity is 14000mg / L.

[0043] The preparation method is the same as in Example 1.

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Abstract

The invention discloses an aqueous solution for improving a CO2 flooding effect of a tight reservoir and a preparation method and an application method of the aqueous solution. The aqueous solution isprepared from, by the total weight of the aqueous solution, 0.01-0.2wt% of a wettability modifier, 0.01-0.1wt% of a penetrating agent, 0.05-0.5wt% of a surfactant for reducing oil-water interfacial tension and the balance water. The technical scheme includes that the aqueous solution, prepared from the wettability modifier, the penetrating agent and the surfactant for reducing oil-water interfacial tension, for improving the CO2 flooding effect of the tight reservoir and CO2 are alternately injected into the reservoir; the wettability modifier modifies micropore surface wettability of a matrix, molecules of the surfactants capable of reducing oil-water interfacial tension permeate into micropores of the matrix under the promoting action of the penetrating agent to expel crude oil out of the micropores under the action of imbibition and the like to reach cracks, and the effect of increasing the oil recovery rate is achieved by CO2 flooding.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and more particularly, relates to a method for improving CO in tight reservoirs 2 Aqueous solution with flooding effect and preparation method and application method thereof. Background technique [0002] Currently foreign CO 2 Oil displacement enhanced oil recovery technology has matured and been widely used, but CO 2 The viscosity is low, and the displacement front is very sensitive to viscous fingering, which makes the injected CO 2 Channeling around displaced oil, channeling reduces CO 2 The sweep efficiency of the oil wells is high, and it is manifested as premature gas channeling in some oil wells, resulting in a decrease in liquid production and a sharp increase in the gas-oil ratio, which makes CO 2 Utilization rates drop and operating costs increase. [0003] abroad for CO 2 Extensive research has been done on gas inrush along fractures during flooding and has been app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594E21B43/22
CPCC09K8/594E21B43/164
Inventor 计秉玉马涛许关利何应付
Owner CHINA PETROLEUM & CHEM CORP
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